EUVD-2026-56337
GHSA-c4q9-ff8m-j29w
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local vector with low-privilege requirement is consistent with DWM interaction requiring an active user session; full CIA impact reflects SYSTEM-level code execution on the vulnerable host.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3DescriptionCVE.org
Access of resource using incompatible type ('type confusion') in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Windows Desktop Window Manager (DWM) Core Library enables any standard authenticated local user to gain full SYSTEM-level control across a wide range of Windows 10, Windows 11, and Windows Server deployments. The vulnerability arises from a type confusion condition in the DWM Core Library - though the CWE-122 classification and vendor tags ('Heap Overflow', 'Buffer Overflow') indicate the confusion likely manifests through or triggers a heap-based memory corruption primitive. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an existing authenticated session on the target system with at minimum standard (non-administrative) user privileges, as reflected by the CVSS PR:L metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.8 with vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H is well-calibrated: low attack complexity, no user interaction required, and a full CIA compromise on the local system make this a reliable post-exploitation escalation primitive for any attacker already holding a standard user session. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply Microsoft's vendor-released patches, which bring affected systems to the following minimum safe build numbers: Windows 10 1607 and Server 2016 to 10.0.14393.9418; Windows 10 1809, Server 2019, and Server 2019 Server Core to 10.0.17763.9115; Windows 10 21H2 to 10.0.19044.7663; Windows 10 22H2 to 10.0.19045.7663; Windows 11 23H2 to 10.0.22631.7517; and Windows Server 2022 to 10.0.20348.5499. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct an inventory of all Windows 10, Windows 11, and Windows Server systems to establish exposure scope, and begin testing the Microsoft-released patches in a non-production environment to assess compatibility. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
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